Sad-iron.



. C. P. MADSEN.

SAD IRON.

APPLIOATON FILED JAISLZZ, 1908.

'1,034,129 v Patented July 30,1912.

2 SHEBTS-SHEET 1.

C. P. MADSEN.

SAD IRON.

APPLICATION IILBD JAN. 22, 190s.

1,034, 129, Patented July 30, 1912. I

2 SHEETS-SHEET 2.

vl MII/1111111' l @9i/Mmmm l, a

*UNITED STATES `iulTENT OFFICE.

CHARLES r. MADSEN, or SALT LAKE CITY, UTAH, AssIGNoE, BY DIRECT AND MESNE ASSIGNMENTS, To rELoUzE MANUFACTURING COMPANY, or CHICAGO, ILLINOIS,

.A CORPORATION OF ILLINOIS. v

SAD-IRON.

specication of Letters raient. A pigmented July 30, 1912.

Application med January 22, 190s. serial No. 412,176.

To dlt fwlzo'm, -z't may concern: I

Be it known that I, CHARLES'P. VMADSEN, citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented a new and useful Sad-Iron, of which the following is a specification.

The invention relates more particularly to electrically heated sad irons, and among the important objects of said invention the following may be noted: First, to providel structure -will be practically eliminated, thereby securing an iron which heats quickly;-

one that is very convenient to operate and one which is economical in the amount of electrical energy absorbed or used. Second, to provide YVa structure in which all of the parts are so constructed, interitted and related-that they can be assembled for use and disassembled for. renewal or repair by an unskilled person, withoutdestroying or disturbing the close adjustment or relation of said parts; in which the interchanging of new for damaged parts andthe expense thereof is confined to the damagedpart; and to -provide a unitary, self-contained and complete heater readily separable from, and mountable in the iron by an unskilled person without the necessity of tinkering with electrical connections. Third, to provide novel and effective means for insuring the proper heating of the different portions of thebottom of the iron. Fourth, to provide a novel structure that will obviate the necessity of placing the ironon a Stand when not in use, thereby avoiding 'lifting the same. Fifth, to provide a combinedfplug and switch of novel construction, so associated with the other features that the op erator can easily graduate the heat to the desired degree without stopping the Ironing operation or detaching the -plug from and Vattaching it to the i'ron.

Figure 1 is a side elevation of the sad iron; Fig. 2 is a vertical longitudinal seci V'tional view therethrough; Fig. 3 is cross sectional view substantially on the line 3-3 of Fig. 2; Fig. t is aA cross sectional view on the line 4 4 of Fig, 2; Fig. 5 is a detail perspective view of the heater unit or element. Fig. 6 isa bottom plan view of the same; Fig. 7 is a horizontal sectional view through the combined switch and plug; Fig. v8 .is a detail Vperspective view of the holding clip for the combined switch and plug.; Fig. 9 isa bottom plan view of a slightly modified form of heater element. i

Similar reference numerals designate corresponding parts in allthe figures of the drawings.

rIn the embodiment illustrated, the fbottom element or ironing plate 10 is flat and rimless. It has the usual triangular form and I makeV it comparatively thin for several purposes, namely, to reduce the 'mass to be heated to a minimum, that the iron may be quickly raised to a working `temperature and for the further purpose of enabling me to place the electric heater or source of heat as close as practicable to the ironing surface. It has an upstanding cene tral enlargement, platform or projection 1l, preferably triangular in form,` and from which rises a single bolt or post 12. This bolt may be either integral with the bot-tom in as desired. The unitary heater unit or element 13 is located or placed upon the bottom plate and comprises a plate or body 14 of asbestos or other suitable insulating material which is also a non-conductor of heat. The under side of this body has a substantially triangularly shaped socket, 'recess or opening 15 that receives, substantially `tits and interloeks with the enlargement '11 of the bottom plate and .the plate tive displacement or rotary movement although they are perfectly free to be separated when the heater or other parts are to be renewed, as clearly shown. The fastening or 'clamping'bolt 12 extends upward through the heater' unit and receives a nut 29 as hereinafterdescribed.

The 'heater unit preferably comprises the insulating body `let in the bottom or under- Side of which is permanently `embedded a and heater unit are thusv locked against rela.

so Y

element or the head may be embedded thereiet 'y ribbon, wire or other strand 18 of electric resistance material thatis formed into convolutions laid or Wound in a `thin single plane or layer around the socket 15, t-he turns thereof reaching substantially the point and the sides of the iron, as shown in F ig. 6. The convolutions, however, .may be extended completely around the socket, as shown in Fig. 9, wherein the strand of resistance material is designated 18a.. The several turns of the conductor are separated by a ribbon or strip of asbestos or other suitable insulating substance 19 which'may. be wound with the ribbon. The exposed edges of the resistance wire 18 are thus substantially flush with the bottom of t-he heating unit and the unit is therefore adapted to present assubst'antially smooth, flat under surface arranged for substantially perfect contact with the upper'surface of the bottom plate. By this construction the heat is most easily transmitted directly to the bottom plate with a minimum loss and with a maximum eliiciency. To prevent t-he low of electricity from the heater coil to the metallic bottom plate I interpose a thin sheet of mica 52 between these members which prevents the exposed edgesv of the winding from contact with the bottom plate, but does not prevent the :flow of heat to any appreciable extent. The mica sheet has a triangular opening to receive theenlargement 11. The lower'side of the heater element 13 is provided with a transverse recess 23 somewhat deeper than and located adjacent to the rear end of the recess or socket 15. bon 18 are carried through the body ofthe heater unit into this recess for connect-ion with suit-able terminals described hereinafter.

The top or Weight element 24 is superimposed upon the heater element and its underside is provided with a large cavity or recess 25 which forms a depending rim or edge 24 and provides a peripheral shoulder 24 extending entirely around the. iron. The lower part of the heater element is provided with a shoulder which is adapted to receive the shoulder 24 and the heater element consequently closes said cavity and supportsthe body or upper part in posltion. The upper part 14 of the heater ele ment is conformed to and fills the cavity and Yas the rim 24 is peripheral and conforms to the shape of the iron the cavity is triangular inr shape and consequently the heater element and body portion, when clamped togethe, are rotatably inter-locked and mutually hold each other agalnst dlsplacement bot-h laterally and rotatively. -For the accommodation of the bolt 12 and nut 29 the top member V24 is provided With a recess 28 in its upper side and with a vert-ical hole or opening 26 which connects the recess 28 The ends of the resistance wire or ribwith the cavity 25. I make this hole 26 larger in diameter than the shank of the bolt to eliminate metallic Contact between the two parts and t-hus prevent the heat which is conveyed up through the bolt 12 from passing directly into the top plate. I preferably pack some heat insulating substance 27 loosely in the space surrounding the bolt to further insulatethe bolt from the top member. The recess 28 accommodates the nut 29 and the nut is thus sunk below the upper surface of the iron out of the way of the fingers of the operator. To further protect the bodv from conveyed heat, I interpose a heat insulating washer 31 below the nut and I protectthis washer by a metallic washer 30 interposed between the nut 29 and the washer 31. The three main parts of my iron are held firmly together in interlocked condition by this single clamping member' or bolt 12 and when the nut 29 is removed these three interlocked parts are freely separable from each other.

In my novel structure I provide a handle which performs the dual function of an operating handle anda support for the iron. 'Ih'is comprises a standard 34 suitably secured by its stem 35 to the forward end only of the iron. The shank carries at its upper end a horizontally disposed rod 36 upon which is a grip 37. This handle, being supported only upon'fthe front end of the iron, leaves the rear portion of the iron clear of obstruction for the plug switch. The grip 37 extends beyond the rear end of the .iron and in conjunction with lugs 38, which project from the rear end of the body 24, supports the iron on its rear end when it is not in use. It is therefore only necessary to tip the iron on end instead of lifting it whenever it is not in active use for a moment. The projecting lugs are preferably formed integrally with the top member and their edges 39 lie in the plane of the free end of the handle. The heater element 13 is provided with terminals 20, which are thin metallic strips arranged in parallel vertical position with their lower ends projecting downward into the recess 23 and to which the ends of the heating coil 18 are suitably attached. These terminals extend upwardly above the upper face of the heater unit and into a longitudinal recess, guideway or groove 33 provided in the rearpart of the upper face of the body 24 and directly beneath the overhanging handle 37. These terminals 20 are held firmly in relative p0- sition by being embedded in an upstanding column or block 21 of insulating material which i-n turn is held in a suitable opening provided in the heater element 14. The top member 24 is provided with a suitable opening 32 through which the block 21 is inserted when the parts of the iron are assembled. The u-pper .ends 22 of the -.terminals project above :the upper -end of fthe block 21 into the guideway .33v and form contact blades in position to be connected with a switch plug :tobe described and .by which the supply of electricity to the iron is controlled. The guideway 33 extends forwardly from the rear end of the iron to the recess 28. vIts .-side walls-formV a suitable longitudinal. guide ffor the switch plug which comprises a block or casing 40 of insulating material `having an upstandng operating knob 41 at its front end which is at all times, while the switch is in the guide-- way, within convenient reach of the fingers ofthe operator. The block is provided with the washer and thumb-nut 29.

a pair of parallel horizontal longitudinal bores 42 in which are located sleeves- 43 terminating at their front ends in lingers 44 that -are arranged to engage the upper ends 22 of the contact blades of the heater. The rea-r ends -of the sleeves 43 constitute receiving sockets for the terminals of the current conductors 45. ably enter the plug through an upstandig loop ear 46 on the plug and are fastened in the contact sleeves by 'screws 47 which also serve to hold the sleeves in place, as is clearly shown in Fig. 7. The switch Aplug is slidable in its guidewayso that 'the current may bev shut olf or turned on. at the will o fthe operator.- However, it obviously may be pulled right out of its socket whenthe iron is to be putaway. In order that the plug may be held in its several positions and at the same timele-:t't free to be entirely disconnected :from the iron, I provide a metallic spring clip 48 having lingers .49 which straddle or embrace the knob 41 and terminate at their free ends in V-shaped por! tions 50. These ends engage in either of two sets of notches 51 in the top of the switch plug and yieldngly hold the switch in either of its =two positions. The clip -is held in position by being clamped under It is to be noted that the knob 41, by which the switch A' plug can he easily moved frompne position to the other is valways positioned directly below 'the handle 37 and in convenient posil tion for the operator to turn'the current on or 'oil without removing the hand from. the

handle.

It will now be clear that my. novel sad iron structure possesses many advantages.

interchangedfor new parts at little expense and without the necessity of destroying the entire iron or returning Yit to the factory for repair. In VJfactv one of the important; purposes of my invention yis to provide an iron which is fool-proof, simple and capa: ble of manipulation or of being readily assembled or disassembled by an unskilled' These conductors prefer-v v complete irons. Each of the .elements maybe manufac- Vtured separately and may be individually person without destroyingY its parts or their adjustment. The several lelements which constitute the complete structure are superimposed one above the other and clamped in their non-rotative engagement by a sinswitch conveniently enables the operatorto gle clamping device, which in this case com- .70 l prises the central bolt and nut.; -The plugV4 make and break the circuit and thereby con. Y

trol the temperature to a n'cety without the hand from the iron.

A further Vadvantage is that the heater unit completely isolates or separates the botf tom element from the top element and there is practically no loss` of heat to the top V'15' stopping the ironing operation or removing Inember by convection orradiation for the` tion should be the center to prevent Scorch# ing. --Byrdistributing the heating winding as shown in- Figs. 6 and 9, these results can' be -readily'andA satisfactorily obtained without the necessity'of cumbersome coils.

As the .electric heating unit gives out after a'longerior shorter use, it has topbe replaced and my novel structure provides for the accomplishment of this necessary repair with the outlay of a minimum of time, labor and expense.v When it is desired to renew the heating unit,it is simply necessary to loosen the single fastening device, disassemble the parts, place the -new heater and other parts together and clamp'them, no careful readvjustment Ais necessary. These heater uni-ts .can :therefore be made as separate articles of manufacture. 'In addition, it is now customary to makeirons of the same weight, but of ditferentteinperatnres for vdifferent4 purposes, and. a.person Vcan purchase extra ,elements of different 'temperature capacities and place them in' position himself, thusv doing away with the "neccssity Yof buyingV extra A further advantage of my novel ironA resides in theeasewith which theV operator controls the temperature of the iron. Here tofore it has beencustomary to provide irons with heating means adapted for the highest temperature required. Consequently when -light workv wasfbeing done great care was necessary to prevent scorching. By the use of my easily-operable switch the -operator using my iron .hasthe temperature under constant and convenient control. When the iron becomes too hot he turns the current off and when it falls below the required temperature turns it on again and all With- `ont removing the hand or stopping operation. This easy cont-rol results in the use of a minimum quantity of electric current. The lugs 38 are long enough to protect the switch when it is withdrawnra suiicient distance to break the electric circuit, so that when the iron is turned on end the Weight of the ironw-ill not accidentally return the switch to its connecting position.

As many modifications of myinvention will doubtless suggest themselves to those skilled in the art, I do not limit or confine my invention to the specific structure herein shown and described.

The circuit closing and breaking device or mechanism disclosed herein forms the subject-matter of and is claimed in my copending divisional application, Serial No. 608,051, and is not specically claimed herein. l

Having thus fully described my invention, what l claim as new, and desire to secure by Letters Patent, is Y l. The improvements herein describedcomprising a metallic body portion containing a cavity, a unitary heater element interlocked with said body portion and closing the cavity therein, said heater element comprising a plate of refractory insulating material, and a single plane resistance winding embedded on one side of said plate with its edges exposed, a heat receiving and transmitting plate interlocked with said heater element, and a central clamping post eX- tending from the hot plate through said element and body portion and secured upon the latter. A

2. The improvements herein described, comprising a body portion, in combination with an electric heater element composed of a plate of refractory insulating material, a

single layer resistance winding on one side thereof, a column of insulating material eX- tending from the plate, and contact blades arranged in said column and with which the ends of said resistance Winding are connected, a switch member having complementary contacts movable into and out of engagement with said blades, a plate to be heated, and means for clamping said heater element between said plate to' be heated and said body.

3.- In an electric sad iron, the `combination with a bottom element, of a self-contained heater unit located thereon and having a portion that-has a non-rotative but freely detachable interlocking engagement with said bottom element to prevent the relative rotay tion of said heater unit and bottom element,

and a single clamping device for securing ksaid elements together and maintaining said portion and the bottom element in interlocked, non-rotative engagement.

4. In an electric heater, the combination with a bottom element having an upstanding triangular platform, ot' a separate heater holding element mounted on the bottom element and comprising a body having a itriangular socket that receives the upstanding platform, resistance wire embedded in said body andarranged in convolutions about the socket therein, and means for clamping said heater holding element upon said bottom element.

5. In an electric heater, the combination of a flat rimless bottom element provided with a central upstanding interlocking projection on its upper side, a thin layer of insulating material placed on the upper side of the bottom element and having an opening-to receive said projection, and a heater holding elementY detachably and non-rotatably interlocked with said bottom element by said projection thereon, and a layer of heating conductor permanently cemented upon the lower side of said heater holding element and separated from the bottom element by said layer of insulating material.

6. ln an electric heater, the combination lwith a bottom element, of a heater holding element associated therewith and including a body that is a poor conductor of heat, a top element, said heater holding element :and top element being provided one with a cavity, the 'other with shouldered edges that detachably engage in the cavity, a bolt and a nut for detachably securing the elements together, and insulating means separating the bolt and nut from the top element.

7. ln an electric heater, the combination with a bottom element, of a heater holding element thereon, a top element supported solely upon the heater elementand having a recessed underside in which theupper portion of the heater holding element is engaged, said heater holding element separating the top and bottom elements and maintaining them out of contact, and a single insulated bolt Anut clamping device extending from said bottom element through said heater element and top element.

8. In an electric heater, the combinationwith a bottom element having an upstanding angular portion, of a heater lholding element located thereon and having an opening that receives said upstanding portion,

a top element resting on and entirely separated and insulated from said bottom element by said heater holding element, and having a recessed underside that receives the upper portion of the heater holding element, and means for fastening the elements together.

9. ln an electric heater, the combination with -a bottom elemnt having -a central upstanding angular portion, of a heater hold- YV1,034,121YY 5 ing element comprising `a body 'ofinsulatingv material having anA interlocking portion that receives the angular portion, and r'esistance material located in the body, an up-V and said top having an opening of greaterV diameter t-hanl the bolt and receiving the bolt, a clamping nuton the upper end of the bolt, and heat insulating material interposed'between the nut and the top element.

' 10. ln an' electric heater, the combination with abottom element, of a topclement having a socket, a heater holding element of non-heat-conducting material interposed between the top and bottom elements, a post composed of insulatinginaterial carried by the heater element and located in the socket fof the top element, and resistance material arranged in the heater holding element and having spaced vterminals located in the post.

11. In an electric heater, the combination with a lat iimless bottom element having a central upstanding enlargement, and a bolt projecting upwardly from the enlargement,

of a heater holding body of insulating material located von the bottom elementand having an interlocking opening that receives the enlargement and through whichV the bolt passes, saidbody being provided with an,

upstanding post, electrical resistance located in the lower portion of the body and havingterminals extending upwardly through the post, a top element located on the heater holding body and having its underside re-v cessed and receiving the saine, said top ele- .ment having an opening ofY greater diameter than the bolt and receiving the same, said top element also having a socket through which the posit passes, a clamping" nut threaded yon the upper portion of the bolt-,.a heat insulating washer interposed between the nut and top element, and velectrical conf' nections with the terminals in the post.

with a bottom element and a heater holding element detachably located thereon, of a top element having a recess in its upper` side,

anda perforation entering the bottom of the recess, a bolt carried by the bottom element and detachably passingv through the heater holding element and the perforation into the recess, and aY clamping nut threaded on the upper end of tle bolt andlocated in the recess. i-

13. In an. electric heater, the combination with a bottom element and a heater holding element of non-heat-co'ndiicting material associated therewith, of a top element` located' 'v Vupon the heater element and having a recess in its upper side and a vertical bolt hole entering t-he bottom of the recess, a securing bearing upon vthe washer. 70 'Y 14:51u an electric sad iron the combination of va comparativelyv thin member to be heated, a self-contained heating device separableas a unit from but-'intimately associated with said member-to be heated and 75 having a non-rotative interlocking engage` ment therewith, a comparatively thick and heavy top member non-rotativcly, but separably'iiiterlocked with said heating device, `and a single clamping means for holding said members in an assembled structure. Y

15. The improvements. herein described,

comprising a body portionv having switch block guides, in combination with an Velectric heater element, comprising'a plate' of 35' 'refractory insulating material containing a resistance Winding and having contact niembers which extend vthrough said body adjacent to said guides,VV a solo plate to be heated,

means clamping said' body and sole plate 90 l upon said element, and a switch block movable in'said guides normally coveringV said contact members and containing contacts for engagement with said members.

16. The improvement herein described,

comprising a body portion, in combination with van electric heater element, comprising a plate of refractory insulating material containing a resistance winding and having 'Y Y contact members which extend through the 100 top of said body, a plate to be heated, means clamping said body and plate upon said element, and a switch block movable on' said body normally' covering said contact members and containing contactsdbrV engage ment with said members. V-

17.V In Aan electric sad iron, a body portion containing al cavity in its lower side and a` hole extending vertically therefrom, in coinbination with a heater element comprising 1 10 a plate carrying aresistance winding and i closing'said cavity, a column of insulating4 12. In anelectric heater., the combinationv forming theterminals of said winding, a iis i bottom v plate to be .heated,inea ns clamping said heater element between said plate and body, and a switch block movable 1oir-said body and containing contacts for engagelment with said blades.

- 18. :In an electric sad iron, a bodyportion containing a bottom cavity and a hole ex- Y tending up through` the body from the eav- Y ity, in" combinationwith a heater comprising .a plate carrying resistance winding and clos-v ing said cavity, a column of insulating material'extending from said platea.A through said hole, contact blades in said column and forming. the terminals of s aid Winding, a

bottoni plate, .means clamping said heater isi element between said bottom plate and body, a switch block movable on said body, and containing contacts for engagement with said blades.

19. In an electric sad iron, a body portion containing a recess. in combination with a unitary, removable heater element in interlocked, but readily separable, engagement with said body and composed of a refractory insulating plate, contact members, and a single layer ribbon winding whereof` said members form the terminals, a plate to be heated interlocked withv said element, and means clamping said element between said plate and said body.

20. In an electric sad iron, the combination with a bottom element, of a top element, a unitary heater holding element clamped between the top and bottom elements and easily separable therefrom, said heater holding element having electrical resistance material therein, and a combined switch and plug separate from the top and bottom elements and detachably associated' with the heater holding element for connect- A ing electrical leads to and disconnecting them from the resistance material.

2l. An electric vsad iron comprising a b-rdy portion having arecess in its underside, in combination with a substantially triangular plate of refractory insulating material suitably inter-locked with the lower edge of said body, a single layer resistance winding upon the lower side of said plate, Contact members Vconnected therewith and rising from the top of said plate, a-'bottom p-late suitably interlocked with said refractory plate, means clamping said body and said bottom plate upon the refractory plate, and a contact block or 'plug having contacts and movable into and out of engagement with the said contact members, substantially as described.

22. An electric sad iron comprising a body portion having av recess in its underside, in combination with a substantially triangular flat plate .ofrefractory insulating material suitably interlocked with the lower edge of said body, a singlelayer resistance winding upon theV lower side of said plate, contact members connected therewith and fixed upon the top of said plate and extending through the top of said body, a bottom plate suitably interloeked with said refractory plate, a post extending from the bottom plate through said refractory plate and body, a nuttheieon for clamping said body and said bottom plate upon the refractory plate.7 and a contact block or plug movablev upon the body and having contacts for engagement with the said contact members.

23. In an electric heater the combination with a flat. riniless bottom element rovided 'with an elongated central upstan ing enlargement, of a flat sheet of insulating material located on the upper side of the element and surrounding said enlargement, and a freely removable heater element resting 'upon said upper side of the bot-tom element and fitting said enlargement, comprising an insulated body having a volute winding of resistance ribbon permanently cemented upon its lower side and separated from the vpassing through said heater holding element and top element, a nut on said bolt for detachably securing all the elements together,

and heat insulating means separating thel bolt and nut from thetop element, substantially as described.

25. In an electric sad iron the combination with a bottom element, of an independent, readily separable heater unit resting thereon and containing a heating conductor in heating relation to said bottom element, and a top element resting on and completely separated from said bottom element by said heater unit, said top element having a recessed underside in which the upper portion of the heater unit is engaged.

26. In an electric sad iron, the combination with a bottom element, of a detachable heater unit thereon, a top element supported solely upon the heater unit and having rim edges with which the upper portion of the heaterelement separably interlocks, said heater element separating and insulating topand bottom elements, a bolt connecting the top and bottom elements and insulated from and passing through the heater unit, and said elements and heater unit being serially interlocked against relative rotation, substantially as described.

27. In an electric sad iron, the combination with a bottom element, of a heater holding element, one of said elements having an interlocking socket, the other having an interlocking enlargement locatedl in the socket, a. top element resting on the heater holding element, one of the latter elements being provided with an opening, the other having an interlocking portion engaged therein, and a single central fastening device for trnily binding the several elements together.

28. In an electric sad iron the combination with a sad iron body, of spaced integral projections extending from the rear end of the same, and a handle grip having a connection solely with the front end of the body, said grip extending beyond the rear .end of said body and adapted in conjuncmember and a light bottom smoothing plate conformed horizontally in Size and shape therewith, in combination with a'unit heating element of equal horizontal dimensions with said top and bot-tom members .interposed therebetween thermically isolating one from the other and adapted to deliver heatA to the bottom plate, and a single device clamping said parts together. v Y

30. A composite electric sad iron body composed of a relatively heavy metallic upper member, a bottom metallic smoothing plate and an interposed body of heat insulating material, said three members being identical in-shape and size at their horizontal meeting surfaces, a single fastening'device binding the members together, and a heating winding permanently carried by saidinsulating body in heating relation to said bottom plate. only.

31, An electric sad iron comprising a thin, flat metallic bottom plate, a unitary heater removably mounted thereon and interlocked therewith against rotary displacement, an upper body 'member removably lmounted upon but rotatively interlocked with vsaid heater, said bottom plate, heater and'upper member conforming to each other in size and shape at their meeting surfaces, and a single device for clamping said parts together.

32. Inan electric sad iron, a body consisting of three distinct parts', namely: a heavy metallic top member a metallic bottom member, which is both thin, and light, A.and an intermediate member of bothheat and electricity insulating material, and means clamping said members firmly but separably together said members being conformed in size and shape to each other at their meeting l surfaces whereby said top and bottom mem# .bers are thermically isolated, from each other when theparts are in operative relation. i y

33. In an electric sad iron a substantially triangular, thin bottom plate, a similarly shaped self-contained heater unit removably superposedv thereon andan interlock for preventing relative displacement thereof, in

l combination with a heavy substantially tri-` angular weight member removably superposed on said heater, said bottom plate, heater unit and Weight member being of substantially identical shape and size horizontally whereby the upperl and lower members are completely isolated from each other against heat radiation by said heater, Aand a single clamping device for fastening .said parts together. 4

' 34. In-an electric sad iron a substantially triangular, thin botto-m plate, a similarly shaped self-contained heater unit removably superposed thereon and substantially completely covering the upper surface thereof, and 'an interlock for preventing relative displacement thereof, in combination with a heavy, substantiallytriangular weight member removably superposedon said heater substantially completely covering the `upper surfaceV thereof and completely isolated against heat radiation from said bottom member by said heater, an interlock for preventing rotation between said upper mem- A CHARLES P. MADSEN.

Witnesses: l

LARRY McDowELL, MARTINI-I. MCGRATH. 

